his number? delete it. i'm deleting it. so break free from the big three. xfinity internet customers take the savings challenge at xfinitymobile.com/mysavings. or visit an xfinity store to learn how our switch squad makes it easy to switch and save hundreds. scientists in south africa working to learn about the omicron variant and the vaccine's efficacy against it. the south african lab where it was discovered, dave mckenzie is live in johannesburg with more on that. fascinating to see as they are working on it. >> reporter: good morning,